When a rock with a portruding edge that is less than ninety degrees in angle is struck on that edge and produces a conical shaped chip or "flake", leaving behind a concave flake scar where the material was removed from the rock, that is a conchoidal mineral.
Magnetite, hematite, pyrite, olivine, limonite, and chalcopyrite do not exhibit cleavage, but instead fracture unevenly.
Quartz
coal
aluminum
A mineral breaks in two ways: cleavage (a definite straight and even break) and fracture (jagged and unpredictable)
Examples: chemical reactivity, toxicity, flammability, stability.
silicate: feldspar and mica non-silicate: halides and native gold
convection
Minerals break in the main two ways cleavage and fracture. Cleavage is breaking in flat planes but fracture is more uneven even unpredictable. The hardest mineral to break would be the diamond, which is placed at a ten on Moh's hardness scale.
calcium
Halite and gypsum are two examples of evaporite minerals.
kyanite and sillimanite
Well, they are all important but two examples would be calcium and magnesium.
Two examples are quartz and mica. Minerals are also classified as metallic or non-metallic.
Vanadinite and molybdenite are two minerals that are categorized in the hexagonal crystal system.
Yes, you are right. It's carnotite and uraninite.
A mineral breaks in two ways: cleavage (a definite straight and even break) and fracture (jagged and unpredictable)
Examples: chemical reactivity, toxicity, flammability, stability.
Halite and Calcite. Halite has what is known as cubiccleavage, where there is cleavage in three directions at 90 degree angles. Calcite has what is known as rhombohedral cleavage, where there is cleavage in three directions but at 120 and 60 degree angles.
silicate: feldspar and mica non-silicate: halides and native gold
Direct and indirect sunlight.